CVE-2026-49991: RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vu
RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-49991
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-499910.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-49991 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for RustFS is a
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-55838: RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.7 and earlier, the …nvd · 2026-06-26
- highCVE-2026-55189: RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-be…nvd · 2026-06-26
- highCVE-2026-55188: RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-be…nvd · 2026-06-26
More from NVD Recent CVEs
- mediumCVE-2026-15485: A flaw has been found in TRENDnet TEW-821DAP 1.11B03. The impacted element is the function sub…2026-07-12
- highCVE-2026-15484: A vulnerability was detected in TRENDnet TEW-821DAP 1.12B01. The affected element is the funct…2026-07-12
- highCVE-2026-15483: A security vulnerability has been detected in TRENDnet TEW-821DAP 1.12B01. Impacted is the fun…2026-07-12
- highCVE-2026-15482: A weakness has been identified in Aster Telecom Azcall 10/11. This issue affects some unknown …2026-07-12
- highCVE-2026-15481: A security flaw has been discovered in Trendnet TEW-635BRM up to 1.00.03. This vulnerability a…2026-07-12